<?php
/////////////////////////////////////////////////////////////////////////////////////
// xbtit - Bittorrent tracker/frontend
//
// Copyright (C) 2004 - 2007  Btiteam
//
//    This file is part of xbtit.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   1. Redistributions of source code must retain the above copyright notice,
//      this list of conditions and the following disclaimer.
//   2. Redistributions in binary form must reproduce the above copyright notice,
//      this list of conditions and the following disclaimer in the documentation
//      and/or other materials provided with the distribution.
//   3. The name of the author may not be used to endorse or promote products
//      derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
////////////////////////////////////////////////////////////////////////////////////

require_once(dirname(__FILE__).'/config.php');

if (!function_exists('bcsub')) {
	function bcsub($first_num, $second_num) {
		return ((int)$first_num)-((int)$second_num);
	}
}

function send_pm($sender,$recepient,$subject,$msg) {
	global $FORUMLINK, $TABLE_PREFIX, $db_prefix, $CACHE_DURATION;

	if ($FORUMLINK=='smf') {
		# smf forum
		# get smf_fid of recepient
		$recepient=get_result('SELECT smf_fid FROM '.$TABLE_PREFIX.'users WHERE id='.$recepient.' LIMIT 1;', true, $CACHE_DURATION);
		if (!isset($recepient[0]))
			return false;
		# valid user
		$recepient=$recepient[0]['smf_fid'];
		if ($recepient==0)
			return false;
		# valid smf_fid
		# get smf_fid of sender
		# if sender id is invalid or 0, use System
		$sender=($sender==0)?0:get_result('SELECT smf_fid, username FROM '.$TABLE_PREFIX.'users WHERE id='.$sender.' LIMIT 1;', true, $CACHE_DURATION);
		if (!isset($sender[0])) {
			$sender=array();
			$sender['smf_fid']=0;
			$sender['username']='System';
		} else $sender=$sender[0];
		# insert message
		quickQuery('INSERT INTO '.$db_prefix.'personal_messages (ID_MEMBER_FROM, fromName, msgtime, subject, body) VALUES ('.$sender['smf_fid'].', '.sqlesc($sender['username']).', UNIX_TIMESTAMP(), '.$subject.', '.$msg.');');
		# get id of message
		$pm_id=mysql_insert_id();
		# insert recepient for message
		quickQuery('INSERT INTO '.$db_prefix.'pm_recipients (ID_PM, ID_MEMBER) VALUES ('.$pm_id.', '.$recepient.');');
		# notify recepient
		quickQuery('UPDATE '.$db_prefix.'members SET instantMessages=instantMessages+1, unreadMessages=unreadMessages+1 WHERE ID_MEMBER='.$recepient.' LIMIT 1;');
		return true;
	} elseif ($FORUMLINK=='' || $FORUMLINK=='internal') {
		# internal forum
		# insert pm
		quickQuery('INSERT INTO '.$TABLE_PREFIX.'messages (sender, receiver, added, subject, msg) VALUES ('.$sender.', '.$recepient.', UNIX_TIMESTAMP(), '.$subject.', '.$msg.')');
		return true;
	}
	return false;
}

function write_file($file, $content) {
	if ($fp=@fopen($file,'w')) {
		@fputs($fp,$content);
		@fclose($fp);
		return true;
	}
	return false;
}

function send_mail($rec_email,$subject,$message, $IsHtml=false, $cc=array(), $bcc=array()) {
	global $THIS_BASEPATH, $btit_settings;

	if (!method_exists('PHPMailer','IsMail'))
		include($THIS_BASEPATH.'/phpmailer/class.phpmailer.php');
	$mail=new PHPMailer();

	if ($btit_settings['mail_type']=='php') {
		$mail->IsMail();                                   # send via mail
		if (!empty($cc))
			$mail->AddCustomHeader('Cc: '.implode(',',$cc));
		if (!empty($bcc))
			$mail->AddCustomHeader('Bcc: '.implode(',',$bcc));
	} else {
		$mail->IsSMTP();                                   # send via SMTP
		$mail->Host     = $btit_settings['smtp_server'];   # SMTP servers
		$mail->Port     = $btit_settings['smtp_port'];     # SMTP port
		$mail->SMTPAuth = true;                            # turn on SMTP authentication
		$mail->Username = $btit_settings['smtp_username']; # SMTP username
		$mail->Password = $btit_settings['smtp_password']; # SMTP password
		if (!empty($cc))
			foreach($cc as $carbon_copy)
				$mail->AddCC($carbon_copy[0],$carbon_copy[0]);

		if (!empty($bcc))
			foreach($bcc as $blind_carbon_copy)
				$mail->AddBCC($blind_carbon_copy[0],$blind_carbon_copy[0]);
	}

	$mail->From     = $btit_settings['email'];
	$mail->FromName = $btit_settings['name'];
	$mail->CharSet  = $btit_settings['default_charset'];
	$mail->IsHTML($IsHtml);
	$mail->AddAddress($rec_email);
	$mail->AddReplyTo($btit_settings['email'],$btit_settings['name']);
	$mail->Subject  =  $subject;
	$mail->Body     =  $message;

	return ($mail->Send())?true:$mail->ErrorInfo;
}

function get_remote_file($http_url,$mode='r') {
	# for first thing we will try with cURL
	if (function_exists('curl_init')) {
		$fp=curl_init();
		curl_setopt($fp, CURLOPT_URL, $http_url);
		curl_setopt($fp, CURLOPT_RETURNTRANSFER, true);
		$stream=curl_exec($fp);
		curl_close($fp);
		if (substr($stream,9,3)!='404')
			return $stream;
	}

	# then with fsockopen
	$purl=parse_url($http_url);
	$port=isset($purl['port'])?$purl['port']:'80';
	$path=isset($purl['path'])?$purl['path']:'/scrape.php';
	$an=($purl['scheme']!='http'?$purl['scheme'].'://':'').$purl['host'];
	$query=isset($purl['query'])?'?'.$purl['query']:'';
	$fp=@fsockopen($an,$port,$errno,$errstr, 60);

	if ($fp) {
		fputs($fp,"GET $path"."$query HTTP/1.0\r\nHost: www.google.com\r\nConnection: close\r\n\r\n");
		$stream='';
		while (!feof($fp))
			$stream.=fgets($fp, 4096);
		@fclose($fp);

		if (substr($stream,9,3)=='404') {
			$stream='';
			# last chance we try slowest fopen
			$fp=@fopen($http_url,$mode);
			if (!$fp)
				return false;

			while (!feof($fp))
				$stream.=fread($fp,4096);
			@fclose($fp);
			#if (substr($stream,9,3)=="404")
				#return false;
		}
		return $stream;
	}
	return false;
}

function get_fresh_config($qrystr) {
	$cache_file=realpath(dirname(__FILE__).'/..').'/cache/'.md5($qrystr).'.txt';

	$mr=do_sqlquery($qrystr,true);
	while ($mz=mysql_fetch_assoc($mr)) {
		if ($mz['value']=='true')
			$return[$mz['key']]= true;
		elseif ($mz['value']=='false')
			$return[$mz['key']]= false;
		elseif (is_numeric($mz['value']))
			$return[$mz['key']]= max(0,$mz['value']);
		else
			$return[$mz['key']]= StripSlashes($mz['value']);
	}
	unset($mz);
	mysql_free_result($mr);

	# write new cache
	write_file($cache_file, serialize($return));
	return $return;
}


function do_sqlquery($qrystr,$display_error=false) {
	global $num_queries;
	$num_queries++;
	$ret=mysql_query($qrystr);
	if ($display_error && mysql_errno()!=0)
		stderr('MySQL query error!',"<br />\nError: ".mysql_error()."<br />\nQuery: $qrystr<br />\n");
	return $ret;
}

function write_cached_version($page, $content='') {
	global $CACHE_DURATION;

	if ($CACHE_DURATION==0)
		return false;

	$cache_file=realpath(dirname(__FILE__).'/..').'/cache/'.md5($page).'.txt';
	if ($content=='')
		$content=ob_get_contents();

	# write cache file
	write_file($cache_file, $content);
	ob_end_flush();
}

function get_cached_version($page) {
	global $CACHE_DURATION;

	if ($CACHE_DURATION==0)
		return false;

	$cache_file=realpath(dirname(__FILE__).'/..').'/cache/'.md5($page).'.txt';

	if (file_exists($cache_file) && (time()-$CACHE_DURATION) < filemtime($cache_file))
		return file_get_contents($cache_file);

	ob_start();
	return false;
}


function get_result($qrystr,$display_error=false,$cachetime=0) { 
	global $num_queries, $cached_querys;

	$cache_file=realpath(dirname(__FILE__).'/..').'/cache/'.md5($qrystr).'.txt';

	if ($cachetime>0)
		if (file_exists($cache_file) && (time()-$cachetime) < filemtime($cache_file)) {
			$num_queries++;
			$cached_querys++;
			return unserialize(file_get_contents($cache_file));
				}

	$return=array();
	$mr=do_sqlquery($qrystr,$display_error);
	while ($mz=mysql_fetch_assoc($mr))
		$return[]=$mz;

	unset($mz);
	mysql_free_result($mr);

	if ($cachetime>0)
		write_file($cache_file, serialize($return));

	return $return;
}

# Reports an error to the client in $message.
# Any other output will confuse the client, so please don't do that.
function show_error($message, $log=false) {
	if ($log)
		error_log("BtiTracker: ERROR ($message)");

	echo 'd14:failure reason'.strlen($message).":$message".'e';
	die();
}


function verifyHash($input) {
	if (strlen($input)==40&&preg_match('/^[0-9a-f]+$/', $input))
		return true;
	return false;
}

# validip/getip courtesy of manolete <manolete@myway.com>
# IP Validation
function validip($ip) {
	if (!empty($ip) && $ip==long2ip(ip2long($ip))) {
		# reserved IANA IPv4 addresses
		# http://www.iana.org/assignments/ipv4-address-space
		$reserved_ips = array (
			array('0.0.0.0','2.255.255.255'),
			array('10.0.0.0','10.255.255.255'),
			array('127.0.0.0','127.255.255.255'),
			array('169.254.0.0','169.254.255.255'),
			array('172.16.0.0','172.31.255.255'),
			array('192.0.2.0','192.0.2.255'),
			array('192.168.0.0','192.168.255.255'),
			array('255.255.255.0','255.255.255.255')
		);

		foreach ($reserved_ips as $r)
			if ((ip2long($ip) >= ip2long($r[0])) && (ip2long($ip) <= ip2long($r[1])))
				return false; 
		return true;
	}
	return false;
}

# Patched function to detect REAL IP address if it's valid
function getip() {
	if (getenv('HTTP_CLIENT_IP') && long2ip(ip2long(getenv('HTTP_CLIENT_IP')))==getenv('HTTP_CLIENT_IP') && validip(getenv('HTTP_CLIENT_IP')))
		return getenv('HTTP_CLIENT_IP');

	if (getenv('HTTP_X_FORWARDED_FOR') && long2ip(ip2long(getenv('HTTP_X_FORWARDED_FOR')))==getenv('HTTP_X_FORWARDED_FOR') && validip(getenv('HTTP_X_FORWARDED_FOR')))
		return getenv('HTTP_X_FORWARDED_FOR');

	if (getenv('HTTP_X_FORWARDED') && long2ip(ip2long(getenv('HTTP_X_FORWARDED')))==getenv('HTTP_X_FORWARDED') && validip(getenv('HTTP_X_FORWARDED')))
		return getenv('HTTP_X_FORWARDED');

	if (getenv('HTTP_FORWARDED_FOR') && long2ip(ip2long(getenv('HTTP_FORWARDED_FOR')))==getenv('HTTP_FORWARDED_FOR') && validip(getenv('HTTP_FORWARDED_FOR')))
		return getenv('HTTP_FORWARDED_FOR');

	if (getenv('HTTP_FORWARDED') && long2ip(ip2long(getenv('HTTP_FORWARDED')))==getenv('HTTP_FORWARDED') && validip(getenv('HTTP_FORWARDED')))
		return getenv('HTTP_FORWARDED');

	return long2ip(ip2long($_SERVER['REMOTE_ADDR']));
}

function hex2bin ($input, $assume_safe=true) {
	if ($assume_safe !== true && ! ((strlen($input)%2) == 0 || preg_match ('/^[0-9a-f]+$/i', $input)))
		return '';
	return pack('H*', $input);
}

# Runs a query with no regard for the result
function quickQuery($query) {
	$results = do_sqlquery($query);
	if (!is_bool($results))
		mysql_free_result($results);
	else
		return $results;
	return true;
}

#========================================
# getAgent function by deliopoulos
#========================================
function StdDecodePeerId($id_data, $id_name) {
	$version_str='';
	for ($i=0; $i<=strlen($id_data); $i++){
		$c = $id_data[$i];
		if ($id_name=='BitTornado' || $id_name=='ABC') {
			if ($c!='-' && ctype_digit($c))
				$version_str.=$c.'.';
			elseif ($c!='-' && ctype_alpha($c))
				$version_str.=(ord($c)-55).'.';
			else
				break;
		} elseif($id_name=='BitComet'||$id_name=='BitBuddy'||$id_name=='Lphant'||$id_name=='BitPump'||$id_name=='BitTorrent Plus! v2') {
			if ($c!='-' && ctype_alnum($c)) {
				$version_str .= $c;
				if($i==0)
					$version_str = (int)$version_str.'.'; 
			} else{
				$version_str .= '.';
				break;
			}
		} else {
			if ($c!='-' && ctype_alnum($c))
				$version_str .= $c.'.';
			else
				break;
		}
	}
	$version_str=substr($version_str,0,strlen($version_str)-1);
	return $id_name.' '.$version_str;
}

function MainlineDecodePeerId($id_data, $id_name) {
	$version_str='';
	for ($i=0,$len=strlen($id_data); $i<=$len; $i++) {
		$c=$id_data[$i];
		if ($c!='-' && ctype_alnum($c))
			$version_str.=$c.'.';
	}
	$version_str=substr($version_str,0,strlen($version_str)-1);
	return $id_name.' '.$version_str;
}

function DecodeVersionString ($ver_data, $id_name) {
	$version_str='';
	$version_str.=intval(ord($ver_data[0]) + 0).'.';
	$version_str.=intval(ord($ver_data[1])/10 + 0);
	$version_str.=intval(ord($ver_data[1])%10 + 0);
	return $id_name.' '.$version_str;
}

function getagent($httpagent, $peer_id='') {
	if($peer_id!='')
		$peer_id=hex2bin($peer_id);
	if(substr($peer_id,0,3)=='-AX')
		return StdDecodePeerId(substr($peer_id,4,4),'BitPump'); # AnalogX BitPump
	if(substr($peer_id,0,3)=='-BB')
		return StdDecodePeerId(substr($peer_id,3,5),'BitBuddy'); # BitBuddy
	if(substr($peer_id,0,3)=='-BC')
		return StdDecodePeerId(substr($peer_id,4,4),'BitComet'); # BitComet
	if(substr($peer_id,0,3)=='-BS')
		return StdDecodePeerId(substr($peer_id,3,7),'BTSlave'); # BTSlave
	if(substr($peer_id,0,3)=='-BX')
		return StdDecodePeerId(substr($peer_id,3,7),'BittorrentX'); # BittorrentX
	if(substr($peer_id,0,3)=='-CT')
		return "Ctorrent $peer_id[3].$peer_id[4].$peer_id[6]"; # CTorrent
	if(substr($peer_id,0,3)=='-KT')
		return StdDecodePeerId(substr($peer_id,3,7),'KTorrent'); # KTorrent
	if(substr($peer_id,0,3)=='-LT')
		return StdDecodePeerId(substr($peer_id,3,7),'libtorrent'); # libtorrent
	if(substr($peer_id,0,3)=='-LP')
		return StdDecodePeerId(substr($peer_id,4,4),'Lphant'); # Lphant
	if(substr($peer_id,0,3)=='-MP')
		return StdDecodePeerId(substr($peer_id,3,7),'MooPolice'); # MooPolice
	if(substr($peer_id,0,3)=='-MT')
		return StdDecodePeerId(substr($peer_id,3,7),'Moonlight'); # MoonlightTorrent
	if(substr($peer_id,0,3)=='-PO')
		return StdDecodePeerId(substr($peer_id,3,7),'PO Client'); # PO Client
	if(substr($peer_id,0,3)=='-QT')
		return StdDecodePeerId(substr($peer_id,3,7),'Qt 4 Torrent'); # Qt 4 Torrent
	if(substr($peer_id,0,3)=='-RT')
		return StdDecodePeerId(substr($peer_id,3,7),'Retriever'); # Retriever
	if(substr($peer_id,0,3)=='-S2')
		return StdDecodePeerId(substr($peer_id,3,7),'S2 Client'); # S2 Client
	if(substr($peer_id,0,3)=='-SB')
		return StdDecodePeerId(substr($peer_id,3,7),'Swiftbit'); # Swiftbit
	if(substr($peer_id,0,3)=='-SN')
		return StdDecodePeerId(substr($peer_id,3,7),'ShareNet'); # ShareNet
	if(substr($peer_id,0,3)=='-SS')
		return StdDecodePeerId(substr($peer_id,3,7),'SwarmScope'); # SwarmScope
	if(substr($peer_id,0,3)=='-SZ')
		return StdDecodePeerId(substr($peer_id,3,7),'Shareaza'); # Shareaza
	if(preg_match('/^RAZA ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/', $httpagent, $matches))
		return "Shareaza $matches[1]";
	if(substr($peer_id,0,3)=='-TN')
		return StdDecodePeerId(substr($peer_id,3,7),'Torrent.NET'); # Torrent.NET
	if(substr($peer_id,0,3)=='-TR')
		return StdDecodePeerId(substr($peer_id,3,7),'Transmission'); # Transmission
	if(substr($peer_id,0,3)=='-TS')
		return StdDecodePeerId(substr($peer_id,3,7),'TorrentStorm'); # Torrentstorm
	if(substr($peer_id,0,3)=='-UR')
		return StdDecodePeerId(substr($peer_id,3,7),'UR Client'); # unidentified clients with versions
	if(substr($peer_id,0,3)=='-UT')
		return StdDecodePeerId(substr($peer_id,3,7),'uTorrent'); # uTorrent
	if(substr($peer_id,0,3)=='-XT')
		return StdDecodePeerId(substr($peer_id,3,7),'XanTorrent'); # XanTorrent
	if(substr($peer_id,0,3)=='-ZT')
		return StdDecodePeerId(substr($peer_id,3,7),'ZipTorrent'); # ZipTorrent
	if(substr($peer_id,0,3)=='-bk')
		return StdDecodePeerId(substr($peer_id,3,7),'BitKitten'); # BitKitten
	if(substr($peer_id,0,3)=='-lt')
		return StdDecodePeerId(substr($peer_id,3,7),'libTorrent'); # libTorrent
	if(substr($peer_id,0,3)=='-pX')
		return StdDecodePeerId(substr($peer_id,3,7),'pHoeniX'); # pHoeniX
	if(substr($peer_id,0,2)=='BG')
		return StdDecodePeerId(substr($peer_id,2,4),'BTGetit'); # BTGetit
	if(substr($peer_id,2,2)=='BM')
		return DecodeVersionString(substr($peer_id,0,2),'BitMagnet'); # BitMagnet
	if(substr($peer_id,0,2)=='OP')
		return StdDecodePeerId(substr($peer_id,2,4),'Opera'); # Opera
	if(substr($peer_id,0,4)=='270-')
		return 'GreedBT 2.7.0'; # GreedBT
	if(substr($peer_id,0,4)=='271-')
		return 'GreedBT 2.7.1'; # GreedBT 2.7.1
	if(substr($peer_id,0,4)=='346-')
		return 'TorrentTopia'; # TorrentTopia
	if(substr($peer_id,0,3)=='-AR')
		return 'Arctic Torrent'; # Arctic (no way to know the version)
	if(substr($peer_id,0,3)=='-G3')
		return 'G3 Torrent'; # G3 Torrent
	if(substr($peer_id,0,6)=='BTDWV-')
		return 'Deadman Walking'; # Deadman Walking
	if(substr($peer_id,5,7)=='Azureus')
		return 'Azureus 2.0.3.2'; # Azureus 2.0.3.2
	if(substr($peer_id,0,8)=='PRC.P---')
		return 'BitTorrent Plus! II'; # BitTorrent Plus! II
	if(substr($peer_id,0,8)=='P87.P---')
		return 'BitTorrent Plus!'; # BitTorrent Plus!
	if(substr($peer_id,0,4)=='Plus')
		return StdDecodePeerId(substr($peer_id,4,5),'BitTorrent Plus! v2'); # BitTorrent Plus! v2 (not 100% sure on this one)
	if(substr($peer_id,0,8)=='S587Plus')
		return 'BitTorrent Plus!'; # BitTorrent Plus!
	if(substr($peer_id,0,7)=='martini')
		return 'Martini Man'; # Martini Man
	if(substr($peer_id,4,6)=='btfans')
		return 'SimpleBT'; # SimpleBT
	if(substr($peer_id,3,9)=='SimpleBT?')
		return 'SimpleBT'; # SimpleBT
	if(ereg('MFC_Tear_Sample', $httpagent))
		return 'SimpleBT';
	if(substr($peer_id,0,5)=='btuga')
		return 'BTugaXP'; # BTugaXP
	if(substr($peer_id,0,5)=='BTuga')
		return 'BTuga'; # BTugaXP
	if(substr($peer_id,0,5)=='oernu')
		return 'BTugaXP'; # BTugaXP
	if(substr($peer_id,0,10)=='DansClient')
		return 'XanTorrent'; # XanTorrent
	if(substr($peer_id,0,16)=='Deadman Walking-')
		return 'Deadman'; # Deadman client
	if(substr($peer_id,0,8)=='XTORR302')
		return 'TorrenTres 0.0.2'; # TorrenTres
	if(substr($peer_id,0,7)=='turbobt')
		return 'TurboBT '.(substr($peer_id,7,5)); # TurboBT
	if(substr($peer_id,0,7)=='a00---0')
		return 'Swarmy'; # Swarmy
	if(substr($peer_id,0,7)=='a02---0')
		return 'Swarmy'; # Swarmy
	if(substr($peer_id,0,7)=='T00---0')
		return 'Teeweety'; # Teeweety
	if(substr($peer_id,0,7)=='rubytor')
		return 'Ruby Torrent v'.ord($peer_id[7]); # Ruby Torrent
	if(substr($peer_id,0,5)=='Mbrst')
		return MainlineDecodePeerId(substr($peer_id,5,5),'burst!'); # burst!
	if(substr($peer_id,0,4)=='btpd')
		return 'BT Protocol Daemon '.(substr($peer_id,5,3)); # BT Protocol Daemon
	if(substr($peer_id,0,8)=='XBT022--')
		return 'BitTorrent Lite'; # BitTorrent Lite based on XBT code
	if(substr($peer_id,0,3)=='XBT')
		return StdDecodePeerId(substr($peer_id,3,3), 'XBT'); # XBT Client
	if(substr($peer_id,0,4)=='-BOW')
		return StdDecodePeerId(substr($peer_id,4,5),'Bits on Wheels'); # Bits on Wheels
	if(substr($peer_id,1,2)=='ML')
		return MainlineDecodePeerId(substr($peer_id,3,5),'MLDonkey'); # MLDonkey
	if($peer_id[0]=='A')
		return StdDecodePeerId(substr($peer_id,1,9),'ABC'); # ABC
	if($peer_id[0]=='R')
		return StdDecodePeerId(substr($peer_id,1,5),'Tribler'); # Tribler
	if($peer_id[0]=='M') {
		if(preg_match('/^Python/', $httpagent, $matches))
			return 'Spoofing BT Client'; # Spoofing BT Client
		return MainlineDecodePeerId(substr($peer_id,1,7),'Mainline'); # Mainline BitTorrent with version
	}
	if($peer_id[0]=='O')
		return StdDecodePeerId(substr($peer_id,1,9),'Osprey Permaseed'); # Osprey Permaseed
	if($peer_id[0]=='S'){
		if(preg_match('/^BitTorrent\/3.4.2/', $httpagent, $matches))
			return 'Spoofing BT Client'; # Spoofing BT Client
		return StdDecodePeerId(substr($peer_id,1,9),'Shad0w'); # Shadow's client
	}
	if($peer_id[0]=='T'){
		if(preg_match('/^Python/', $httpagent, $matches))
			return 'Spoofing BT Client'; # Spoofing BT Client
		return StdDecodePeerId(substr($peer_id,1,9),'BitTornado'); # BitTornado
	}
	if($peer_id[0]=='U')
		return StdDecodePeerId(substr($peer_id,1,9),'UPnP'); # UPnP NAT Bit Torrent
	# Azureus / Localhost
	if(substr($peer_id,0,3)=='-AZ') {
		if(preg_match('/^Localhost ([0-9]+\.[0-9]+\.[0-9]+)/', $httpagent, $matches))
			return "Localhost $matches[1]";
		if(preg_match('/^BitTorrent\/3.4.2/', $httpagent, $matches))
			return 'Spoofing BT Client'; # Spoofing BT Client
		if(preg_match('/^Python/', $httpagent, $matches))
			return 'Spoofing BT Client'; # Spoofing BT Client
		return StdDecodePeerId(substr($peer_id,3,7),'Azureus');
	}
	if(ereg('Azureus', $peer_id))
		return 'Azureus 2.0.3.2';
	# BitComet/BitLord/BitVampire/Modded FUTB BitComet
	if(substr($peer_id,0,4)=='exbc' || substr($peer_id,1,3)=='UTB'){
		if(substr($peer_id,0,4)=='FUTB')
			return DecodeVersionString(substr($peer_id,4,2),'BitComet Mod1');
		if(substr($peer_id,0,4)=='xUTB')
			return DecodeVersionString(substr($peer_id,4,2),'BitComet Mod2');
		if(substr($peer_id,6,4)=='LORD')
			return DecodeVersionString(substr($peer_id,4,2),'BitLord');
		if(substr($peer_id,6,3)=='---' && DecodeVersionString(substr($peer_id,4,2),'BitComet')=='BitComet 0.54')
			return 'BitVampire';
		return DecodeVersionString(substr($peer_id,4,2),'BitComet');
	}
	# Rufus
	if(substr($peer_id,2,2)=='RS'){
		for ($i=0; $i<=strlen(substr($peer_id,4,9)); $i++){
			$c = $peer_id[$i+4];
			if (ctype_alnum($c) || $c == chr(0))
							$rufus_chk = true;
			else break;
		}
		if (isset($rufus_chk))
			return DecodeVersionString(substr($peer_id,0,2),'Rufus');
	}
	# BitSpirit
	if(substr($peer_id,14,6)=='HTTPBT' || substr($peer_id,16,4)=='UDP0') {
		if(substr($peer_id,2,2)=='BS') {
			if($peer_id[1]==chr(0))
				return 'BitSpirit v1';
			if($peer_id[1]== chr(2))
				return 'BitSpirit v2';
		}
		return 'BitSpirit';
	}
	#BitSpirit
	if(substr($peer_id,2,2)=='BS') {
		if($peer_id[1]==chr(0))
			return 'BitSpirit v1';
		if($peer_id[1]==chr(2))
			return 'BitSpirit v2';
		return 'BitSpirit';
	}
	# eXeem beta
	if(substr($peer_id,0,3)=='-eX') {
		$version_str = '';
		$version_str .= intval($peer_id[3],16).'.';
		$version_str .= intval($peer_id[4],16);
		return "eXeem $version_str";
	}
	if(substr($peer_id,0,2)=='eX')
		return 'eXeem'; # eXeem beta .21
	if(substr($peer_id,0,12)==(chr(0)*12) && $peer_id[12]==chr(97) && $peer_id[13]==chr(97))
		return 'Experimental 3.2.1b2'; # Experimental 3.2.1b2
	if(substr($peer_id,0,12)==(chr(0)*12) && $peer_id[12]==chr(0) && $peer_id[13]==chr(0))
		return 'Experimental 3.1'; # Experimental 3.1

	#if(substr($peer_id,0,12)==(chr(0)*12)) return 'Mainline (obsolete)'; # Mainline BitTorrent (obsolete)
	#return '$httpagent [$peer_id]';
	return $httpagent; # 'Unknown client';
}
#========================================
#getAgent function by deliopoulos
#========================================
?>